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 Related Terms
 Arithmetic Mean:  The sum of the numbers in a set of data divided by the number of pieces of data. Also simply called "mean." This is what we usually call "average.".
Geometric Mean: If a/x = x/b (or x2 = ab), then x is called the geometric mean between a and b. The geometric mean is sometimes called the mean proportional.
Measures of Central Tendency: Numerical values used to describe the overall clustering of data in a set, or the overall "average" of a set of data. The three most common measures of central tendency are the mean, median, and mode.
Median: The number in the middle of a set of data when the data are arranged in order. When there are two middle numbers, the median is their mean.
Mode: The number that occurs most frequently in a set of numbers.
Average: An average is a numerical value used to describe the overall clustering of data in a set. Average is usually used to indicate an arithmetic mean. However, an average can also be a median or a mode.
Mean: The sum of the numbers in a set of data divided by the number of pieces of data. This is what we usually call "average." Also called the arithmetic mean.